CN101998424A - Systems and methods for mitigating interference between access points - Google Patents

Systems and methods for mitigating interference between access points Download PDF

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Publication number
CN101998424A
CN101998424A CN2010102510053A CN201010251005A CN101998424A CN 101998424 A CN101998424 A CN 101998424A CN 2010102510053 A CN2010102510053 A CN 2010102510053A CN 201010251005 A CN201010251005 A CN 201010251005A CN 101998424 A CN101998424 A CN 101998424A
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China
Prior art keywords
access point
antenna beam
cooperation
access points
antenna
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CN2010102510053A
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Chinese (zh)
Inventor
杨绍铭
陈俊杰
梁恒正
左德朗
黄飚
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FiMax Technology Ltd
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FiMax Technology Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/0434—Power distribution using multiple eigenmodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0491—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity
    • H04B7/0495—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more sectors, i.e. sector diversity using overlapping sectors in the same base station to implement MIMO for antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering

Abstract

The invention provides systems and methods for mitigating interference between access points. The Systems and methods which implement cooperative techniques at wireless network access points to provide interference mitigation are shown. Embodiments utilize cooperative antenna beam adaptation techniques wherein antenna beam selection, selective antenna beam transmission power, and/or antenna beam null selection is implemented based upon the communication environment created by a plurality of access points. Additionally or alternatively, embodiments utilize cooperative antenna beam isolation techniques wherein narrow channel filters are implemented with respect to antenna beam signals and/or shielding is arranged between various antenna beams based upon the communication environment created by a plurality of access points. Embodiments additionally or alternatively utilize cooperative antenna beam coordination techniques wherein transmission and/or reception of signals is coordinated, the use of antenna beams is coordinated, and/or interference cancellation is implemented based upon the communication environment created by a plurality of access points.

Description

Be used to alleviate the system and method that disturbs between access point
Technical field
Relate generally to communication of the present invention more specifically, relates to the interference that alleviates between the access point, during for example when a plurality of access point mutual near neighbors or otherwise by the generation interference of deployment ground.
Background technology
Developed regions in the world, the communications infrastructure have become and almost have been seen everywhere.Wired and wireless communication system has spread all over all populous zones.For example, in recent years, the wireless communication system (for example, being used to provide moving speech communication, wireless broadband link etc.) with various configurations is by widespread deployment.Usually, for the covering on a large scale (for example, urban area or other big geographic areas) that service area is provided, the base station that these wireless communication system utilizations for example can be disposed by the honeycomb arrangement mode or the network of access point.
Usually, want to dispose access point network provide the wireless communication infrastructure of serving big zone be the difficulty and expensive.For example, in order physically to dispose access point, must obtain lease and easement there from the land owner usually.Such lease and easement are (for example because the influences of feeling attractive in appearance that may be associated with the deployment of access point) that can't obtain from a lot of land owners there, and very expensive usually.Therefore, in fact can only obtain less relatively physical location and dispose access point.In addition, the deployment of access point usually needs attached infrastructure, for example be used to dispose tower or other elevated structures of antenna system, the optical fiber that is used for data backhaul (backhaul) or other high bandwidth data link, be used to hold the place transceiver apparatus physical premises, be used to provide essential power electric main line (electric main), or the like.All so attached infrastructure have increased disposes the cost and the complexity that cover that access point provides service area on a large scale.
Communication system, especially wireless communication system is subject to interference effect, no matter disturbs to have external noise or from the form of the interference signal of each station of communication system self.For example, the wireless network (for example, aforementioned cellular radio) that provides service area to spread all over covering generally includes a plurality of radio nodes, the signal of these radio node radiation may with the neighbour or other nodes that otherwise are deployed in the network disturb.Realized that a lot of schemes and agreement are used for not taking into account subsidiary communications intrusively.
Some wireless communication system has been realized Frequency Division Duplexing (FDD) (FDD) so that isolate up link and downlink communication, for example global system for mobile communications (GSM), Code Division Multiplex insert (CDMA) cellular system, Long Term Evolution (LTE) cellular system, or the like.Though these FDD technology provide certain other interference mitigation of level, the amount of frequency spectrum that these Technology Needs are considerable.Specifically, each in up link and the down link all needs by the separated frequency band that separates of relatively large boundary belt (guard band), and these frequency bands may have bigger bandwidth is held required throughput.Such frequency spectrum is not easy to obtain usually, for example because the available bandwidth of frequency spectrum permission and/or unauthorized frequency.Therefore, the FDD technology is unavailable or unpractical for some communication system implementation.
Various wireless communication systems (for example, IEEE 802.11 (WiFi) wireless network, IEEE802.16 (WiMAX) wireless network, personal handyphone system (PHS) or the like) realized time division duplex (TDD) scheme, so that in up link and down link, use identical frequency spectrum.But in a plurality of remote terminals and network system that diverse access point is communicated by letter, the transmission of a this node may stop the reception of other transmissions of another this node.When in nearer relatively scope, disposing particular sections point or otherwise specific node and have relatively more clearly sight line, this TDD transmission may be because the relative signal level, the adjacent partition etc. of neighbour's degree, channel stops or the reception of otherwise big large disturbance different channels (for example, the different frequency channel in frequency multiplexing access (FDMA) TDD system) relatively.Therefore, though the spectrum efficient utilization is provided, realize that the system of TDD technology may be owing to network service suffers very big interference.
The cellular radio implementation utilizes channel plan/reuse scheme that the interference mitigation of certain level is provided usually.For example, be assigned to each access point from the particular subset of the FDMA channel of the frequency band that wireless network utilized, thereby make do not have the FDMA channel to be reused by neighbouring or neighboring access points.The channel reuse factor (ratio that same channel can be used in network) normally 1/3,1/4,1/7,1/9 and 1/12 (perhaps, according to some notation, depend on that notation is 3,4,7,9 and 12), wherein, the denominator of the channel reuse factor is the number that can't use the sub-district that same channel transmits.For aforementioned FDD, such channel reuse scheme is not used frequency spectrum effectively.
Summary of the invention
The present invention is directed at the wireless network access point place and realize that cooperation technology is to provide the system and method for interference mitigation.Embodiment is by using the cooperation antenna beam to control to assist in close neighborhood the deployment of (or otherwise arranging to such an extent that experience is disturbed) a plurality of access points.For example, embodiments of the invention utilization cooperation antenna beam adaptation technique is wherein realized antenna beam selection, selectivity antenna beam transmitting power and/or antenna beam selection at zero point based on the communication environment of being created by a plurality of access points.In addition or replacedly, embodiments of the invention utilization cooperation antenna beam isolation technology is wherein realized narrow channel model and/or is provided shielding between each antenna beam based on the communication environment of being created by a plurality of access points at antenna beam signal.Embodiments of the invention can additionally or alternatively utilize cooperation antenna beam coordination technique, wherein based on the communication environment of creating by a plurality of access points, and the emission of signal and/or receive coordinatedly, the use of antenna beam is coordinated, and/or realizes interference eliminated.
Cooperation antenna beam control technology of the present invention is particularly useful for TDD communication.Specifically, even when network node is disposed in close neighborhood and makes that the transmission of different nodes in same frequency band will cause greatly disturbing, embodiments of the invention also can assist the use of TDD technology and the intensive of FDMA channel to reuse.
Embodiments of the invention make the number of basic site location minimize, thereby have reduced the total cost of disposing.By using notion of the present invention, a plurality of access points can be placed in the close neighborhood of a basic website, wherein can alleviate the total cost of disturbing and can reducing deployment.
Feature of the present invention and technological merit have quite broadly been summarized in the front, so that can understand detailed description of the present invention subsequently better.The supplementary features of the present invention and the advantage of the theme that constitutes claim of the present invention will be described hereinafter.It will be appreciated by those skilled in the art that disclosed notion and specific embodiment can be by easily with making an amendment or being designed for the basis of other structures of implementing identical purpose of the present invention.Those skilled in the art should also be appreciated that such equivalent constructions can not break away from the spirit and scope of the present invention that propose as claims.When in conjunction with the accompanying drawings when the following description, will understand better believed as the novel feature of characteristic of the present invention (about its tissue and method of operation) with and other objects and advantages.But, will clearly understand, every accompanying drawing all be for diagram and purpose of description and provide and do not wish as limitation of the present invention.
Description of drawings
In order more fully to understand the present invention, come in conjunction with the accompanying drawings now with reference to following description, in the accompanying drawings:
Fig. 1 illustrates the wireless communication system adaptive according to embodiments of the invention;
Fig. 2 illustrates the configuration according to the basic site equipment of the embodiment of the invention;
Fig. 3 illustrates the details according to the access point configuration of the embodiment of the invention;
Fig. 4 illustrates according to the embodiment of the invention and is suitable for providing angle and the multifarious access point antenna system configuration of polarization;
Fig. 5 illustrate according to the embodiment of the invention be used to use cooperation antenna beam adaptation technique that the operation of cooperation antenna beam control is provided, wherein realize that based on the communication environment of creating by a plurality of access point antenna beam selects;
Fig. 6 illustrate according to the embodiment of the invention be used to use cooperation antenna beam adaptation technique that the operation of cooperation antenna beam control is provided, wherein realize selectivity antenna beam transmitting power based on the communication environment of creating by a plurality of access point;
Fig. 7 illustrate according to the embodiment of the invention be used to use cooperation antenna beam adaptation technique that the operation of cooperation antenna beam control is provided, wherein realize that based on the communication environment of creating by a plurality of access point antenna beam zero point (null) selects;
Fig. 8 illustrates the operation that is used to provide cooperation antenna beam isolation technology according to the embodiment of the invention, wherein realizes shielding (shielding) between the various antenna beams based on the communication environment of being created by a plurality of access point;
Fig. 9 illustrates the operation that is used to provide cooperation antenna beam coordination technique according to the embodiment of the invention, wherein realizes emission and/or receive coordinating based on the communication environment of being created by a plurality of access point;
Figure 10 illustrates the operation that is used to provide cooperation antenna beam coordination technique according to the embodiment of the invention, wherein realizes the coordination use of antenna beam based on the communication environment of being created by a plurality of access point; And
Figure 11 illustrates the operation that is used to provide cooperation antenna beam coordination technique according to the embodiment of the invention, wherein realizes interference eliminated based on the communication environment of being created by a plurality of access point.
Embodiment
Fig. 1 illustrates the wireless communication system adaptive according to embodiments of the invention.Specifically, wireless communication system 100 is illustrated and comprises basic website 110a-110d and terminal 120a-120f, and wherein each basic website has the service area (being shown service area 111a-111d respectively) that is associated with it.Among basic website 110a-110d and the terminal 120a-120f each is the radio node of wireless communication system 100, and wherein these radio nodes can wirelessly be communicated by letter each other.For example, can provide two-way link between a basic website in basic website 110a-110d and the associated terminal among the terminal 120a-120f, provide broadband connections with between.Basic website 110a-110d for example can be coupled to various other systems, network or the like by for example network 130, with communicating by letter between auxiliary these systems and network and the terminal 120a-120f.Therefore, the wireless communication system 100 of illustrated embodiment provides the honeycomb type wireless network deployment, radio communication in the auxiliary service area that constitutes by the gathering of service area 111a-111d of this deployment, wherein service area 111a-111d (for example provides service to the different piece of assembling service area, though may there be interference in service area 111a-111d each other, they are nonoverlapping in fact).
Should be appreciated that such radio node that in the wireless communication system adaptive, can comprise arbitrary number according to embodiments of the invention, and the given number of basic website shown in therefore the notion of argumentation is not limited to here and terminal.In addition, for the wireless communication system adaptive, can utilize the various deployment configuration and the technology of radio node according to embodiments of the invention.Therefore, embodiments of the invention are not limited to particular exemplary cordless communication network configuration shown in Figure 1.
Basic website 110a-110d can comprise the various configurations that are suitable for providing radio communication in the respective service district.For example, among the basic website 110a-110d any one can comprise the one or more access points (or other base station transmitter and/or acceptor circuit) that are suitable for providing according to one or more agreements radio communication, for example can realize TDD technology (for example WiFi, WiMAX or the like).Realize preferably that at basic website 110a-110d cooperation technology provides the interference mitigation in the wireless communication system 100.Such cooperation technology can provide under the control of the controller 112 of illustrated embodiment.For example, according to embodiments of the invention, the operation of controller 112 can be controlled at the one or more cooperation antenna beams that provide among the basic website 110a-110d, for example to realize cooperation antenna beam adaptation technique, cooperation antenna beam isolation technology and/or cooperation antenna beam coordination technique.
The controller 112 of embodiment comprises the system based on processor, (for example for example can comprise CPU (CPU), memory, random access storage device (RAM), read-only memory (ROM), flash memory, magnetic memory, optical memory or the like), suitable input/output interface (for example, network interface, USB (USB), serial data line, parallel data grabbing card, video interface or the like) and the instruction set (for example, software, firmware or the like) that defines operation described herein.For example, controller 112 can provide with the form of the general-purpose computing system that is configured or is adapted for the operation that the embodiments described herein is provided.In addition or replacedly, the embodiment of controller 112 can comprise special circuit, for example application-specific integrated circuit (ASIC) (ASIC), programmable gate array (PGA) or the like.
Though be illustrated in the centralized configuration at Fig. 1 middle controller 112, should be appreciated that the difference configuration that can utilize controller 112 according to embodiments of the invention.For example, the controller 112 of embodiment can provide by decentralized configuration, for example spreads all over a plurality of controllers that separate 112 that wireless communication system 100 is disposed or that otherwise communicate by letter with their basic website by use.In addition or replacedly, the function of controller 112 can be integrated in the circuit of the one or more access points among the basic website 110a-110d.For example, the specific function of controller 112 can be provided by the circuit of the access point among the basic website 110a-110d, and other functions of controller 112 can be provided by the centralized circuit that is illustrated as controller 112 in Fig. 1.
Terminal 120a-120f can comprise the different terminals configuration of arbitrary number.For example, one or more among the terminal 120a-120f can comprise personal computer (PC), PDA(Personal Digital Assistant), cell phone, personal hand-held phone, network application or provide any other equipment of radio communication to it.Terminal can provide radio communication according to the corresponding one or more agreements of being utilized with basic website 110a-110d of agreement, for example can realize TDD technology (for example WiFi, WiMAX or the like).
The network 130 of illustrated embodiment can comprise various forms of network infrastructures and configuration, for example Local Area Network, metropolitan area network (MAN), wide area network (WAN), Intranet, extranet, internet, public switch telephone network (PSTN), line transmission system, wireless network, satellite communication system, or the like.The network 130 of illustrated embodiment provides backhaul and/or backbone (backbone) communication at wireless communication system 100, for example is provided to the outside network and the communication link of system.In addition, the network 130 of illustrated embodiment provides the data communication between the system of wireless communication system 100, (for example for example provide payload data communication, between each terminal in terminal 120a-120f) and/or control data communication (for example, between the circuit of controller 112 and basic website 110a-110d and/or between the discrete circuitry of controller 112).
As previously mentioned, usually the network of disposing basic website for the wireless communication infrastructure of serving big zone is provided is very difficult and expensive, for example owing to dispose that the required lease of basic website or easement are difficult to obtain usually or very expensive and to dispose the cost of basic site apparatus and attached infrastructure thereof also very high, described attached infrastructure for example is tower or other elevated structures that is used to dispose antenna system for this, the optical fiber or other high bandwidth data link that are used for the data backhaul, be used to hold the physical premises of place transceiver apparatus, be used to provide the electric main line of essential power, or the like.Yet, need a plurality of so basic websites that the abundant covering in required service district is provided usually.In addition, in any one time, the equipment of any one basic website be limited in usually its terminal that can serve number, its data volume that can deliver, its link number that can support, or the like.Therefore, need to dispose a plurality of communication capacities that repeat auxiliary block post to need of this equipment usually.
Fig. 2 illustrates the configuration according to the basic site equipment of the embodiment of the invention.Specifically, basic website 110 (its can corresponding among the basic website 110a-110d of Fig. 1 any one) comprises and is arranged to the access point 210a-210c that the radio communication in the service area 111 (its can corresponding among the service area 111a-111d of Fig. 1 any one) is provided.For example, access point 210a-210c can comprise separately can operate the access point that is used for providing according to the WiFi agreement radio communication, for example by using different FDMA channels (for example, using WiFi channel 1,6 and 11 respectively) in each comfortable same working band.The access point of the basic website 110 of illustrated embodiment provides multiple access point to dispose, to assist the radio communication in the service area 111 that the gathering by the service area that is associated with each access point constitutes, wherein the service area that is associated with each access point provides service (for example, the service area that is associated with access point 210a-210c is nonoverlapping in fact) to the different piece of service area 111.
Should be appreciated that among the access point 210a-210c of basic website 110 each disposed close to each otherly.Therefore, even when using different FDMA channels, also may experience great interference at these access points.For example, when the basic website 110a at Fig. 1 realizes the basic site configuration of Fig. 2, access point 210a may be stopped by the emission of the signal of terminal 120b the reception of the signal of terminal 120a, although the signal of terminal 120b is to be transmitted into access point 120b's on different FDMA channels, this be because terminal 120a disposed with access point 210a apart from each other, and terminal 120b is disposed very near access point 210a (although being deployed in the service area of access point 210b), and terminal 120b just launches on the relative nearer FDMA channel with the employed frequency of access point 210a of frequency.Similarly, by the same token, the signal emission institute that the reception that terminal 120a launches the signal of access point 210a may be access in a 210b stops.Should be appreciated that this interference is not limited to the access point of the colocated in fact of illustrated embodiment.Other configurations (no matter still be different basic website at same basic website) of access point may be experienced similar interference, for example when these access points disposed relatively near and between access point, have a Clear Line Of Sigh.
Therefore, each among the access point 210a-210c of illustrated embodiment is utilized the antenna beam configuration, can realize the cooperation antenna beam control according to notion of the present invention thus.Specifically, the illustrated embodiment of access point 210a-210c comprises the multi-antenna beam configuration that is suitable for providing cooperation antenna beam technology as described herein.
Pay close attention to Fig. 3, be illustrated at more details according to the embodiment of the access point configuration of the embodiment of the invention.Specifically, access point 210 embodiment illustrated in fig. 3 (its can corresponding among the access point 210a-210b any one) comprises transceiver circuit 310, beam selection circuit 320, beam-shaper circuit 330 and antenna system 340.Each assembly of transceiver circuit 310, beam selection circuit 320, beam-shaper circuit 330 and/or antenna system 340 can be worked under the control of controller 112 so that the control of the cooperation antenna beam here to be provided.
The transceiver circuit 310 of illustrated embodiment comprises: emission/reception wireless device 311 that the signal modulation and demodulation are provided; Frequency mixer 312a-312d and local oscillator (LO) 313a and the 313b that are associated, they provide the frequency inverted between base band frequency, intermediate frequency and the radio frequency; And transmit/receive switch 314, it provides the time-division visit of the air interface that antenna system 340 is provided.The signal processing circuit 318 that is coupled to emission/reception wireless device 311 shown in the figure can be used to provide the required processing to signal, for example provide data buffering, protocol conversion, digital-to-analogue and/or analog-to-digital conversion, interference eliminated, packet route, or the like.
The transceiver circuit 310 of illustrated embodiment also comprises various signal conditioning effects (conditioning) assembly, for example baseband filter 315a and 315b and amplifier 316a-316c, and they are used to provide the desired signal attribute.Illustrated embodiment at transceiver circuit 310 also illustrates channel model 317a-317e.As below with more detailed argumentation, channel model 317a and 317b, 317c and 317d and 317e provide the alternate channel filter configuration respectively, and it can be used to utilize according to realize the cooperating antenna beam control of the cooperation antenna beam isolation technology of the embodiment of the invention.
Beam selection circuit 320 can comprise switching circuit, attenuator circuit, amplifier circuit and/or other circuit, but their Be Controlled are used for coupled transceiver circuit 310 selectively and the one or more selected antenna beam that provided by antenna system 340 and the signal between the beam-shaper circuit 330.For example, can use switch matrix that the selectively coupled of signal between transceiver circuit 310 and the one or more antenna beam is provided.In addition or replacedly, can utilize the variable gain amplifier that is associated with each antenna beam between transceiver circuit 310 and antenna beam, (for example to provide signal selectively, the Amplifier Gain that is associated with particular antenna beam can be reduced to zero, does not wherein have signal will be coupled to transceiver circuit 310 at this antenna beam).
Beam-shaper circuit 330 can comprise various forms of Wave-packet shaping networks, for example fixed beam network, adaptive beam network, or the like.For example, embodiments of the invention utilize the Butler matrix that fixed beam network (for example, one 4 taking advantage of 4 Butler matrix that 4 fixed antenna beams are provided) is provided.Embodiments of the invention can utilize controllable phase shift and/or signal weighting network that adaptive beam shaping is provided, and use for describing here.According to embodiments of the invention, can be suitable for aforesaid combination.
Antenna system 340 can be utilized various antenna element configuration, for example patch antenna element, monopole antenna elements, dipole antenna element or the like, these antenna element is deployed in the configuration that is suitable for cooperating with beam selection circuit 320 so that required antenna beam to be provided.For example, antenna system 340 can comprise multirow and multiple row patch antenna element, these patch antenna element are properly spaced out, so that free space, make up longways or mutually mutually the time to its signal that provides, to define required antenna beam pattern by the antenna element radiation from beam selection circuit 320 with disappearing.
Provide four antenna beams basic identical, that angle is various though be shown as, should be appreciated that the antenna system 340 of embodiment and the antenna beam that beam-shaper circuit 330 can provide arbitrary number and configuration.In addition, can utilize various forms of antenna beam diversity, for example space diversity, polarization diversity, angle diversity or the like.For example, Fig. 4 illustrates and is suitable for providing angle and the multifarious configuration of polarization.Specifically, the antenna system 340 of Fig. 4 comprise be coupled to beam-shaper circuit 330 the antenna element with different polarization (for example, have the subsystem of the antenna element row and column that antenna element constituted of left-leaning polarization and subsystem with antenna element row and column that antenna element constituted of Right deviation polarization), thus the antenna beam signal of separation is provided at the antenna element with different polarization.
With reference to figure 5, it illustrates the operation of using cooperation antenna beam adaptation technique that the wireless communication system 100 of cooperation antenna beam control is provided, wherein realizes the antenna beam selection based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 5, experience is main in the antenna beam 211f of access point 210b and 211h disturbs, so controller 112 operation control beam selection circuit 320 are removed and selected these antenna wave beam to be used for transmitting and receiving of transceiver circuit 310.Though the wave beam 211f and the 211h of illustrated embodiment are disengaged selection, wave beam 211e and 211g can keep activity at transmitting and receiving both.This operation especially csma (CSMA) agreement (for example WiFi) is needed, with the macroreticular throughput decay of avoiding being associated with the detection of interference signal transmission.
For example, near the emission of access point (for example access point of access point 210c or another basic website) may provide following signal emission: this signal emission has stopped that effectively access point 210b receives the signal in the one or both among antenna beam 211f and the 211h.Similarly, the terminal of communicating by letter with another access point (for example access point of access point 210c or another basic website) may provide following signal emission: the signal that this signal is launched access point 210b in the one or both that has stopped effectively in antenna beam 211f and 211h receives.Therefore, illustrated embodiment only selects antenna beam 211e and 211g to be used for transmitting and receiving of access point 210c at the operation of access point 210b, thereby provide the adaptive of service area 111 and part access point 210b, to avoid in the interference that continues when this service area partly provides radio communication in some part at least.Embodiments of the invention can operate be used for temporarily or partly remove to select (for example, during the period of known or predicted interference, remove select, only at emission or receive remove select, or the like or their combination) so that required communication service to be provided.
The selection of aforementioned antenna beam/releasing selects to provide the control of cooperation antenna beam, and wherein other antenna beams of other antenna beams of the adaptive permission access point of antenna beam 210b and other access points carry out continuous, uncrossed operation.On the contrary, access point 210b for the independent operation that overcomes this interference (for example, the transmitting power that increases by the terminal request that increases transmitting power, disturbed, or the like, and need not cooperative operation described herein) may cause not wishing the result that sees at the interference at other antenna beam places and other.
Should be appreciated that the foregoing description operation is used for that both remove and select antenna beam 211f and 211h at transmitting and receiving operation, so that auxiliary service or higher-quality service to the terminal in the zone that is deployed in these antenna wave beam.In other words, if the reception as signal in foregoing example is stopped effectively at antenna beam 211f and 211h, selected to have avoided terminal (for example to receive signal that access point 210b launched for the releasing of the antenna beam of emission, pilot signal) situation receives or all receives but the response of terminal or other emissions can't be access in a 210b.Therefore terminal in the zone of the antenna beam that this releasing is selected can be associated with this access point by another antenna beam (perhaps with lower data rate), be associated with another access point that the overlapping covering of certain level at least is provided, reorientate being deployed in the antenna beam that enough services are provided, or the like.
Pay close attention to Fig. 6 now, it illustrates wireless communication system 100 and uses cooperation antenna beam adaptation technique that the operation of cooperation antenna beam control is provided, and wherein realizes optionally antenna beam transmitting power based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 6, at least the antenna beam 211d of a certain amount of non-nominal interference and access point 210a and the antenna beam 211e of access point 210b be associated (for example, these antenna wave beam may experience interference itself or at the interference source of other nodes in the network).Controller 112 operation is used to control beam selection circuit 320 and reduces the signal transmission power that is associated with these antenna wave beam.
For example, the interference from antenna beam 211d to antenna beam 211e can be detected.Therefore, may be blocked or otherwise greatly be disturbed by the reception that is arranged in the signal that among antenna beam 211d or the 211e or terminal in another launch.Therefore, illustrated embodiment at the operation change of access point 210a (at antenna beam 211d) and access point 210b (at antenna beam 211e) signal power level that is associated with antenna beam 211d and 211e (for example, the gain that the decay that is provided by the transmission path signal attenuator has been provided and/or has reduced to be provided) by the transmission path variable gain amplifier, thereby provide the part that is associated with access point 210a and 210b adaptive of service area 111, shown in the antenna beam 611d and 611e that are produced.Controller 112 can be operated attenuator circuit and/or the amplifier circuit that is used to control beam selection circuit 320, with the signal transmission power that reduces to be associated with these antenna wave beam.Therefore, the antenna beam 611d that produced and the interference between the 611e have been avoided.This fit in continuation and in some part of this server section at least, provide radio communication in auxiliary the interference avoid.Embodiments of the invention can operate be used for temporary transient or antenna beam that periodic variation is selected for required communication service is provided (for example, during the interference period of known or prediction, emission or reception period, or the like or their combination).
The change of aforementioned antenna beam signal provides the control of cooperation antenna beam, and wherein the antenna beam signal transmitting power changes permission access point 210a and other antenna beams of 210b and other antenna beams of other access points and carries out continuous, uncrossed operation.On the contrary, the independent operation of access point 210a and 210b may continue to provide very big interference at other antenna beams in the wireless communication system 100, node etc.Equally, the independent operation that carries out in order to overcome the interference of being experienced by these access points self of access point 210a and 210b (for example, the transmitting power that increases by the terminal request that increases transmitting power, disturbed, or the like, and need not cooperative operation described herein) may cause not wishing the result that sees at the interference at other antenna beam places and other.
Be to be appreciated that, according to embodiment, the signal launching electrical level that the foregoing description operation reduces antenna beam to be providing adaptive (shown in the antenna beam 611d and the 611e) of service area 111, thereby makes and at access point 210a and 210b radio communication is revised on up link and both downlink.For example, in operation according to the embodiment of the invention, be arranged in terminal in antenna beam 211d in the zone that is not included in antenna beam 611d or 611e or the antenna beam 211e will be not from corresponding access point received signal (for example pilot signal or the like) (or will to be lower than the level received signal of operational threshold), and therefore can not be associated or otherwise set up up link with access point.Therefore terminal in the zone of the antenna beam of Gai Bianing can be associated with access point by another antenna beam (perhaps with lower data rate) like this, be associated with another access point that the overlapping covering of certain level at least is provided, reorientate being deployed in the antenna beam that enough services are provided, or the like.According to embodiment, this operation is at the service or the higher-quality service of the terminal aid in improved in the zone that is deployed in these antenna wave beam.In other words, if the reception at antenna beam 211d and 211e signal is greatly disturbed, then, change antenna beam and be provided the zone of radio communication, thereby avoid providing the not service of good quality these terminals with limiting terminal at least at the period of disturbing emission.When taking place to disturb with other antenna beams or other network nodes when the signal of the antenna beam after the change or via the terminal that one of antenna beam that changes is communicated by letter with access point, change zone that antenna beam served by antenna beam with restriction and both reduced the interference that the emission by antenna beam signal directly causes, also reduced the interference that is associated with the emission of the terminal of serving by antenna beam.
With reference to figure 7, wireless communication system 100 uses cooperation antenna beam adaptation technique to provide the operation of cooperation antenna beam control to be illustrated, and wherein realizes antenna beam selection at zero point based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 7, beam forming technique is used to control the employed antenna pattern of access point, and need not sacrifice the signal quality that terminal experienced that communicates with.Such embodiment preferably provides the antenna beam zero point of pointing to interference or potential interference source, keeps the required covering of server or terminal wherein simultaneously.
For example, because relative proximity, the access point 210b of basic website 110 disturbs with a certain amount of at least non-nominal that 210c might provide and/or receive relative access point 210a.Therefore, according to illustrated embodiment, adaptive beam shaping and/or other beam forming techniques are used for realizing being used to reduce the antenna beam zero point of this interference.According to embodiment, when access point 210a launched, its beam-shaper circuit 330 was controlled to form antenna pattern zero point to access point 210b and 210c, to reduce these other access point emitted power towards basic website 110.In addition or replacedly, according to embodiment, when access point 210a received, its beam-shaper circuit 330 was controlled to form antenna pattern zero point to access point 210b and 210c, with the interference that reduces to receive from these other access points of basic website 110.The circuit that controller 112 can be controlled beam-shaper circuit 330 (for example, the phase delay and/or the weighting that are associated with the signal specific path) and/or the circuit of beam selection circuit 320 (for example, decay and/or amplifying circuit) provide one or more zero points in suitable direction.
Embodiments of the invention can be realized antenna beam configuration predetermined or that set up in advance, and the antenna beam that is used to provide suitable is selected zero point.For example, using predetermined antenna beam configuration can adapt to various access point deployments known or expection arranges.According to exemplary embodiment, access point 210a-210c is applicable to and is deployed in same basic website place, with on tower or other structures, the radio communication service of using the triangle deployment scheme set up in advance to come in whole service area 111, to provide collaboratively basic omnidirectional.Determine therefore to be provided to handle the zero point on the direction of other access points of this basic site configuration the antenna beam zero point that is used for the antenna system of each access point.Should be appreciated that to provide a plurality of access point deployment configurations of setting up in advance, to be used to using predetermined antenna beam to determine to dispose zero point.Therefore, embodiments of the invention can provide a plurality of such being configured to be used for selecting one or more suitable configurations to dispose or be provided with the access point of customized configuration.
Refer again to Fig. 3, use cooperation antenna beam isolation technologies that the cooperation operation that antenna beam is controlled is provided description wireless communication system 100, wherein based on the narrow channel model of the communication environment realization of creating by a plurality of access point at antenna beam signal.In the access point of wireless communication system 100 any one may experience from the non-nominal in any source in the multiple source (comprise other access points, the terminal of communicating by letter with other access points, or the like) to be disturbed.For example, though may utilize at each access point place of wireless communication system 100 in the communication band different channels (for example, in frequency reuse scheme, utilize the FDMA channel), but the access point of the embodiment of wireless communication system 100 all is operated in the same communication band.Therefore, Lin Jin (for example adjacent) access point can use frequency channels close relatively on frequency.As an example, neighboring access point 210a, 210b and the 210c of basic website 110 can utilize WiFi frequency channels 1,6 and 11 respectively.In addition, the access point of adjacent basic website can be reused these identical frequency channels.Close relatively propinquity, sight line or the like and combine with the use of relative close frequency channels can be so that in the signal that appreciable interference " outflow " receives to access point clearly.
Embodiment shown in Figure 3 comprises the channel model 317a-317e of transceiver circuit 310.Channel model 317a-317e provides the passband of relative narrower so that the frequency band of individual channel passes through, and abandons the signal (for example, other of communication band even adjacent channel) outside (decay) this passband simultaneously substantially.The channel model 317a of illustrated embodiment and 317b, 317c and 317d and 317e provide the alternate channel filter configuration respectively, control because can be used to realize the cooperation antenna beam according to isolation technology.For example, channel model 317a-317e can provide the band passband of 20MHz wide, with at using transmitting and receiving signal both providing high adjacent channel to abandon of WiFi channel in the wireless communication system.
Utilize the embodiment of channel model 317e that following configuration is provided: both carry out adjacent channel and abandon the individual channel filter at transmitting and receiving signal.Therefore, the channel model 317e of embodiment is installed between antenna system and the antenna port, receives/transmit before the duplex.Channel model 317e preferably is chosen as has the passband that is associated with the frequency channels of transceiver circuit 310 work (for example, access point will utilize specific WiFi frequency channels).For example, depend on the employed frequency channels of access point, the centre frequency of channel model 317e may be selected specific or other interior the allowed channels of frequency band in the channel 1,6,11.The selection of particular centre frequency (passband selection) can realize by automatic or manual.For example, channel model 317e can comprise tuned cell, allows to select passband (for example being selected by controller 112) according to the particular access point of being disposed.In addition or replacedly, depend on the particular access point of being disposed, can provide the difference configuration of channel model 317e selective and install.Except or adjustment selected at the employed certain frequency channel of access point, the embodiment of channel model 317e can also have weatherproof design or be installed in the weatherproof house, and for example (for example on mast, or the like) holds its deployment near the access point antenna system.
Utilize the embodiment of channel model 317c and 317d that following configuration is provided: channel model 317c carries out adjacent channel at received signal and abandons, and channel model 317d carries out adjacent channel at the signal of emission and abandons.This embodiment is auxiliary to be arranged in channel model in the protected house identical with other circuit of transceiver circuit 310, thereby avoids and add a cover cost and the material that brings in weatherproof house for these filters.As above-mentioned channel model 317e, channel model 317c and 317d are preferably elected as has the passband that is associated with the frequency channels of transceiver circuit 310 work (for example, access point will utilize specific WiFi frequency channels).For example, depend on the employed frequency channels of access point, the centre frequency of channel model 317c and 317d may be selected corresponding to specific one in the channel 1,6,11.The selection of particular centre frequency (passband selection) can realize by automatic or manual.For example, channel model 317c and 317d can comprise tuned cell, allow to select passband (for example under the control of controller 112) according to the particular access point of being disposed.In addition or replacedly, depend on the particular access point of being disposed, can provide the different configurations of channel model 317c and 317d selective and install.
Be similar to above-mentioned channel model 317c and 317d, utilize the embodiment of channel model 317a and 317b that following configuration is provided: channel model 317a carries out adjacent channel at received signal and abandons, and channel model 317b carries out adjacent channel at the signal of emission and abandons.This embodiment is auxiliary to be arranged in channel model in the protected house identical with other circuit of transceiver circuit 310, thereby avoids and add a cover cost and the material that brings in weatherproof house for these filters.Though channel model 317a and 317b provide the passband that is suitable for abandoning the channel adjacent with the employed frequency channels of access point, the centre frequency of this passband can be independent of employed certain frequency channel.In other words, channel model 317a and 317b are disposed in not being operated in the part (intermediate-frequency section of circuit) on the wireless transmission radio frequency of transceiver circuit 310 here.Therefore, with filtered signal by frequency inverted (for example by frequency mixer 312b and 312d), thereby make the signal of the employed channel of access point can be disposed in the passband of channel model 317a and 317b.In this configuration,, can utilize single fixed passband at a lot of different frequency channels by select the frequency inverted (for example, the suitable adjustment of the frequency of LO 313a and 313b) of appropriate amount by the operation of frequency mixer 312b and 312d.The selection of LO frequency can realize by automatic or manual.For example, the LO frequency can be selected under the control of controller 112 or select by the manual tuning of its one or more tuned cells.Though Fig. 3 illustrates different LO, embodiments of the invention can make up and only use a LO, for example when when the carrier frequency of amplifier 316a output place is identical with carrier frequency in radio transceiver 311 inputs.
Though discussed embodiment at the use of the channel model in transmitting and receiving signal path, embodiments of the invention can use the difference configuration of these channel models.For example, if desired, the channel model of embodiment can only provide on emission or received signal path.
Though discussed embodiment at the use of 20MHz passband among channel model 317c, 317d and the 317e, at these channel models, embodiments of the invention can utilize different passbands.For example, if desired, the channel model of embodiment can use 5,10 or 40MHz.Though at the situation that transmits and receives the channel model that signal use to separate has been discussed embodiment,, for example in order to save cost, embodiments of the invention can utilize a filter, and this filter switches transmitting and receiving between the circuit.
Can have all kinds and configuration according to the employed filter of embodiments of the invention.For example, embodiments of the invention can utilize surface acoustic wave (SAW) filter, cavity filter, dielectric filter, or the like.
With reference now to Fig. 8,, the operation that cooperation antenna beam isolation technology is provided of wireless communication system 100 is illustrated, and wherein realizes shielding between the various antenna beams based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 8, physical shielding is used to make the minimum interference from other antennas of basic website, and the signal quality that terminal experienced that can materially affect communicate with.The physical shielding of embodiment can comprise between the antenna element that is arranged in an access point and the antenna element of one or more access points of basic website between the plane of reflection, Gauss surface or the like.In addition or replacedly, can comprise fabric structure between the antenna of the access point that is arranged in basic website (for example, wall, roof, metal fence, metallic plate, or the like) according to the employed physical shielding of embodiment.The support that access point utilized that basic website is installed may be suitable for making physics and/or the electrical separation maximization between the access point antenna of basic website.
With reference to figure 9, the operation that cooperation antenna beam coordination technique is provided of wireless communication system 100 is illustrated, and wherein realizes emission and/or receive coordinating based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 9, some or all access point of wireless communication system 100 was ranked by the time, to be used for launching simultaneously or to receive simultaneously.For example, the communication clock of access point can periodically be ranked to be used for call duration time synchronously.This can pass through synchronously, and use is assisted independently or the access point circuit of distributed method for synchronous (for example, global positioning system (GPS) receiver) is realized.In addition or replacedly, this can provide the public or time of concentration data (for example, internet or remote controller or the like) of concentrated method for synchronous to realize by use synchronously.For example, as shown in Figure 9, access point can be ranked by the time, be used in time slot 901 places emission, in time slot 902 places, receive, emission in time slot 903 places, in time slot 904 places, receive, or the like.
According to embodiments of the invention, aforementioned be used for launching simultaneously be ranked with the time that receives simultaneously that to communicate by letter be to realize at CSMA agreement (for example, those agreements of WiFi radio communication).Therefore, all access points of cordless communication network or selected access point are operating as synchronously and transmit and receive, therefore avoided being detected as the situation of carrier wave near the interference signal of the high power transmission of access point (for example, on other close on the adjacent channel or on frequency channels).In the operation according to above embodiment, each such access point will receive in time slot 901 emissions and at time slot 902, and it is unavailable under the CSMA agreement owing to disturb between access point to cause medium to be confirmed as with the phase mutual interference of avoiding them.The terminal of wireless communication system 100 can be by using the CSMA technology, being provided the time control that is ranked from the paging channel transmission of access point etc.
Can based on various standards select and adjust the distribution (being the percentage of launch time to time of reception) of time of reception launch time.For example, communicate by letter with typical the Internet or internet protocol TV (IPTV) use the transfer of data that is associated can be provided on the down link major part communication (for example, 90% access point emission and 10% access point receive), and the transfer of data that is associated with the long-distance video supervision can provide the major part communication on the up link (for example, 5% access point is launched and 95% access point receives).Certainly, other situations can be between up link and down link allocate communications are (for example more equably, emission of 50% access point and 50% access point reception), for example digitized voice communication voice (VoIP) telephone communication of Internet Protocol (for example, based on).The distribution of aforementioned launch time and time of reception can be selected and adjusts by the operation of controller 112, the up link and the downlink communication that need with auxiliary block post.For example, controller 112 can be analyzed the communication that is associated with following access point: at described access point, the suitable method of salary distribution is determined in emission and reception simultaneously when providing the time to be ranked.This analysis can provide the mixing of dissimilar communication, average, weighted average etc., thereby helps to determine to adapt to the launch time of various communications and the distribution of time of reception at each such access point place.In addition or replacedly, the operation that the distribution of aforementioned launch time and time of reception can be by controller 112, adjust automatically according to the QoS or the ToS label that are associated with application.
With reference to Figure 10, the operation that cooperation antenna beam coordination technique is provided of wireless communication system 100 is illustrated, and wherein realizes the coordination use of antenna beam based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 10, be scheduled to avoid the interference between the antenna beam at transmitting and receiving regularly of particular antenna beam.For example, the communication clock of access point can be by periodically synchronously (for example, use global positioning system (GPS) receiver, satellite time transmission, internet or remote controller, or the like), with provide can according to its coordinate antenna beam transmit and receive regularly distributed or centralized synchronously.
For example, in the embodiment shown in fig. 10, determined to disturb with the signal coherence that receives at antenna beam 211d place from the emission of antenna beam 211e.Therefore, be scheduled (for example, the operation of the control beam selection circuit 320 by controller 112) service time of antenna beam 211e, so that antenna beam 211e can not carry out emission when antenna beam 211d is used to received signal.Therefore, disturb and avoided, continuous (at least periodically) provides service in the entire portion of the service area that is associated with access point 210b simultaneously.
Figure 11 illustrates the operation that is used to provide cooperation antenna beam coordination technique of wireless communication system 100, wherein realizes interference eliminated based on the communication environment of being created by a plurality of access point.Specifically, in the embodiment shown in fig. 11, provide interference cancellation circuit 1117a-1117c at access point 201a-201c respectively, remove interference components near access point to be used for processing signals.The part that such interference cancellation circuit can be used as the signal processing circuit 318 shown in the transceiver circuit 310 of Fig. 3 provides.
In operation according to the embodiment of the invention, from near access point (for example, the neighboring access point of basic website) possible interference signal can be known, this for example by each access point under the control of controller 112 by network 130 near access point provide coherent signal emission information to realize.Such information can comprise signal, emission (maybe will the launch) signal of access point emission (maybe will launch) time, emission (maybe will launch) signal via particular antenna beam (or other channel informations), or the like.The signal that is received by near access point can use signal that this information handles reception to remove the interference components of present " known " that be associated with near one or more other access points.For example, the signal of reception can be switched to base band and be digitized, and digitized signal is processed to remove the interference components from neighboring access point.
These cooperation interference cancellation techniques allow very efficiently and effectively to delete interference components, are known because be rendered as the signal specific of interference.Embodiments of the invention can additionally or alternatively utilize interference cancellation circuit to provide to have the elimination of the interference components of " the unknown " essence.For example, the interference cancellation circuit of embodiment can be used to eliminate the peak signal that appears in the received signal, for example when and compare with the terminal that a particular access point is associated, the terminal that is associated with another diverse access point be positioned to more near this particular access point or and this particular access point between when having more clearly the website line.
Though described specific embodiment, should be appreciated that notion of the present invention is not limited to described individual embodiment with reference to each accompanying drawing.Therefore, according to the present invention, notion as described herein, feature, function and structure can realize according to the mode different with the mode of expressing proposition here.For example, according to embodiment, aforementionedly everyly can make up realization.
Such exemplary embodiment will be used cooperation antenna beam control (the wherein communication environment realization antenna beam selection of creating based on a plurality of access point of cooperation antenna beam adaptation technique, as discussed in reference to Figure 5) with cooperate the antenna beam coordination technique (wherein, realize emission and/or receive coordinating based on the communication environment that a plurality of access point is created, combine as discussed in reference to Figure 9).This embodiment removes the particular antenna beam of selecting to cause causing with one or more other antenna beams interference during can operating the period that is used for being ranked in the time that does not have to be used for to launch simultaneously and/or receive simultaneously, utilizes this particular antenna beam simultaneously during having used the period that time of being used for launching simultaneously and/or receiving simultaneously is ranked.Therefore, disturb and avoided, wireless communication system 100 is operated and is used for providing communication service at whole service area simultaneously.
Another such exemplary embodiment will be used cooperation antenna beam control (the wherein communication environment realization antenna beam selection of creating based on a plurality of access point at zero point of cooperation antenna beam adaptation technique, as discussed in reference to Figure 7) with cooperate the antenna beam coordination technique (wherein, the communication environment of creating based on a plurality of access point realizes that the coordination of antenna beam uses, and combines as discussed in reference to Figure 10).This embodiment can operate and be used for: when the antenna beam that the wave beam arrangement of time will cause selecting simultaneously otherwise disturbing with the signal coherence of particular antenna beam, use the adaptive beamforming technology to handle the antenna pattern zero point (zone of the signal amplitude that perhaps reduces) of certain level at least towards this particular antenna beam.
For the combination of the cooperation technology of realizing two kinds of technology here without limits.For example, any one among the aforementioned exemplary embodiment or both can additionally realize as top with reference to figure 3 described one or more channel models.
Various technology can be used to determine the interference between particular access point, the particular antenna beam etc., to be used to realize the cooperation technology according to the embodiment of the invention.For example, the technical staff can carry out test and/or the interference that is associated with access point, antenna beam, terminal, external source etc. or the possibility of interference are determined in modeling.In addition or replacedly, the system of wireless communication system can operate and be used to carry out test and determine the interference that is associated with access point, antenna beam, terminal, external source etc. or the possibility of interference.
Can provide setting and placement algorithm at controller 112, determine interference at the application of cooperation technology of the present invention.For example, after the one or more access points of initial deployment, controller 112 can be controlled the access point scanning interference signal of wireless communication system 100.For example, each access point can be controlled to by its each antenna beam with next a mode transmit (for example paging signal).Correspondingly, controller 112 can control wireless communication system 100 other access points during each antenna beam by above-mentioned access point transmits by its each antenna beam with next mode received signal.Such signal transmits and receives and can utilize each to have an opportunity as the access point (or interested each access point) of emission access point and each monitors that other access points (or interested each other access point) of received signal are repeated iteratively certainly.
By analyzing received signal, particular access point controller 112 can be operated to be used to discern and carry out mutual with it and experience maybe may experience the particular antenna beam of each access point of interference.For example, the signal when the particular antenna beam emission of using first access point is used the particular antenna beam of second access point, when receiving with threshold power level, can determines, this two particular antenna beam phases mutual interference.Can execution analysis wait and discern the one or more cooperation technologies that to realize at these two antenna beams, to avoid or to alleviate interference with the signal to noise ratio of the particular level of determining received signal, received signal.Such analysis can comprise and temporarily realizes particular candidate cooperation technology (for example, during paging signal aforementioned transmits and receives repetition), comes the validity at these technology of interference analysis.
The suitable cooperation technology that the aforementioned arrangements algorithm can be used to determine during except the system that disposes wireless communication system or will be adopted every now and then as an alternative.For example, such placement algorithm can by periodically (for example, every day, weekly, every month, or the like) call, come operation at communication environment optimization wireless communication system that subsequently will be popular.Exemplary embodiment (for example, very early time in every day) during the period that has seldom or do not have wireless network traffic is periodically called such placement algorithm, so that the influence of wireless communication system is minimized.
Though reference pin has been described embodiment to the applied cooperation technology of a plurality of access points that is arranged in the relative closer neighborhoods that a basic website is provided, notion of the present invention may be used on other configurations of access point.For example, above-mentioned cooperation technology can be applied to the access point of the different basic websites of wireless communication system 100 shown in Figure 1.But, should be appreciated that cooperation technology described herein helps efficient, the reliable operation of the access point in very close neighborhood, for example employed access point when basic website is provided as shown in Figure 2.The cooperation technology is here put basic website (wherein at auxiliary such multiple access, access point utilizes channel close relatively on the frequency and otherwise depends on CDMA technology assists multichannel to insert) aspect is particularly useful, for example access point by adaptive with situation according to the WiFi protocol operation under.For example, be easy to the channel that disturbs slightly and depend on the transmission that CDMA technology adapts to interference though use, but be adapted to be the access point of realizing cooperation technology of the present invention and (for example allow the high channel reuse scheme, reusing of the channel at adjacent basic website place), avoided in the CSMA system, otherwise stopping the interference of transmission simultaneously.
Though described the present invention and advantage thereof in detail, should be appreciated that, under the situation of the spirit and scope of the present invention that do not break away from claims and limited, can carry out various changes, replacement and change.In addition, the application's scope is not wished the specific embodiment of the combination of the process, machine, manufacturing, theme, device, method and the step that are confined to describe in specification.Those of ordinary skills will find easily from disclosure of the present invention, according to the present invention, can utilize and carry out essentially identical function with corresponding embodiment described herein or realize the existing of essentially identical result or subsequently with the combination of process, machine, manufacturing, theme, device, method and the step of exploitation.Therefore, claims wish to be included in the combination that comprises these processes, machine, manufacturing, theme, device, method and step in its scope.
The application relates to the following U.S. Patent application of common unsettled and common transfer: the sequence number 11/842,864 that is entitled as " Adaptive Interference Control " that on August 21st, 2007 submitted; The sequence number 11/770,559 that is entitled as " Systems and Method Using Antenna Beam Scanning for Improved Communications " that on June 28th, 2007 submitted; With the sequence number of submitting on May 22nd, 2,009 12/470,537 that is entitled as " Multi-Function Wireless Systems and Methods ", above-mentioned disclosure in first to file is incorporated into this by reference.

Claims (40)

1. system comprises:
A plurality of wireless network access points, they be deployed as provide by be associated with each access point in described a plurality of wireless network access points, nonoverlapping substantially service area partly constitutes one assembles service area; And
With the control logic that each access point in described a plurality of wireless network access points carries out data communication, this control logic can be operated and is used for controlling the particular access point of described a plurality of wireless network access points to be used to the interference mitigation of cooperating.
2. the system as claimed in claim 1, wherein said a plurality of wireless network access points are disposed in a plurality of basic websites place.
3. it is adaptive that the system as claimed in claim 1, wherein said cooperation interference mitigation are included in the cooperation antenna beam of realizing at described particular access point under the control of described control logic.
4. system as claimed in claim 2, wherein said cooperation antenna beam is adaptive to be included in the antenna beam of realizing at described particular access point under the control of described control logic and to select.
5. system as claimed in claim 2, wherein said cooperation antenna beam is adaptive to be included in the selectivity antenna beam transmitting power that realizes at described particular access point under the control of described control logic.
6. system as claimed in claim 2, wherein said cooperation antenna beam is adaptive to be included in the antenna beam of realizing at described particular access point under the control of described control logic and to select zero point.
7. the system as claimed in claim 1, wherein said cooperation interference mitigation comprise that the cooperation antenna beam of realizing at described particular access point isolates.
8. system as claimed in claim 6, wherein said cooperation antenna beam is isolated and is comprised the narrow channel model of realizing at described particular access point.
9. system as claimed in claim 6, wherein said cooperation antenna beam is isolated and is comprised the antenna beam shielding that realizes at described particular access point.
10. the system as claimed in claim 1, wherein said cooperation interference mitigation comprise that the cooperation antenna beam of realizing at described particular access point coordinates.
11. system as claimed in claim 9, wherein said cooperation antenna beam coordinates to comprise the coordinates transmission of described particular access point to signal.
12. system as claimed in claim 9, wherein said cooperation antenna beam coordinates to comprise that described particular access point receives the coordination of signal.
13. system as claimed in claim 9, wherein said cooperation antenna beam coordinates to comprise that described particular access point uses the coordination of antenna beam.
14. system as claimed in claim 9, wherein said cooperation antenna beam coordinates to comprise the coordinates interference elimination of described particular access point.
15. the system as claimed in claim 1, wherein said control logic comprises:
The centralized control logic of communicating by letter with the one or more access points in described a plurality of wireless network access points by network.
16. the system as claimed in claim 1, wherein said control logic comprises:
Distributed control logic, at least a portion that its one or more access points with in described a plurality of wireless network access points with described control logic are arranged explicitly.
17. the system as claimed in claim 1, the access point in wherein said a plurality of wireless network access points comprises wireless local network connecting point.
18. the system as claimed in claim 1, the access point in wherein said a plurality of wireless network access points comprise the access point according to the operation of IEEE 802.11 communication protocol standards.
19. the system as claimed in claim 1, the access point in wherein said a plurality of wireless network access points comprise the access point of realizing the TDD scheme.
20. system as claimed in claim 19, wherein said TDD scheme is selected from following group: WiMAX, PHS and TD-SCHMA.
21. the system as claimed in claim 1, each access point in wherein said a plurality of wireless network access points comprises multibeam antenna system.
22. a system comprises:
Have the basic website of wireless network of a plurality of access points, each access point in described a plurality of access points uses a plurality of antenna beams to provide radio communication in the service area of described wireless basic website; And
With each the access point controller in communication in described a plurality of access points, it is suitable for controlling described access point and uses described a plurality of antenna beam interference mitigation of cooperating.
23. the system as claimed in claim 22, wherein said cooperation interference mitigation are included in the antenna beam of realizing at the particular access point in the described access point under the control of described controller and select.
24. the system as claimed in claim 22, wherein said cooperation interference mitigation are included in the selectivity antenna beam transmitting power that realizes at the particular access point in the described access point under the control of described controller.
25. the system as claimed in claim 22, wherein said cooperation interference mitigation are included in the antenna beam of realizing at the particular access point in the described access point under the control of described controller and select zero point.
26. the system as claimed in claim 22, wherein said cooperation interference mitigation comprise the narrow channel model of realizing at described access point.
27. the system as claimed in claim 22, wherein said cooperation interference mitigation comprise the antenna beam shielding that realizes at described access point.
28. the system as claimed in claim 22, wherein said cooperation interference mitigation comprises the coordinates transmission of described access point to signal.
29. the system as claimed in claim 22, wherein said cooperation interference mitigation comprise that described access point receives the coordination of signal.
30. the system as claimed in claim 22, wherein said cooperation interference mitigation comprise that the particular access point in the described access point uses the coordination of antenna beam.
31. the system as claimed in claim 22, wherein said cooperation interference mitigation comprise the coordinates interference elimination of the particular access point in the described access point.
32. the system as claimed in claim 22, wherein said access point are operated according to IEEE 802.11 communication protocol standards radio communication are provided.
33. the system as claimed in claim 22, wherein said access point is operated according to csma communication protocol.
34. the system as claimed in claim 22, wherein said a plurality of antenna beams provide nonoverlapping substantially service area to cover.
35. a method comprises:
Arrange that a plurality of access points form at least one basic website so that radio communication to be provided in service area, each access point in described a plurality of access points has a multibeam antenna system, is used for providing in described service area described radio communication;
From the wireless communication frequency band of a plurality of channels, select different channels to be used in described service area, providing described radio communication for each access point in described a plurality of access points; And
Control the access point in described a plurality of access point, to alleviate interference between the access point in described a plurality of access point by adjusting the one or more parameters that are associated with the antenna beam of the multibeam antenna system of one or more access points.
36. method as claimed in claim 35, wherein said at least one basic website is a plurality of basic websites.
37. method as claimed in claim 35 also comprises:
Carry out layoutprocedure and determine the particular antenna beam that is associated with the carrying out diverse access point that causes alternately disturbing in described a plurality of access points.
38. method as claimed in claim 37, wherein said layoutprocedure by with described a plurality of access points in the deployment of one or more access points carry out explicitly.
39. method as claimed in claim 37, wherein said layoutprocedure is periodically carried out during the service life of described a plurality of access points.
40. method as claimed in claim 35 also comprises:
Use the channel of selecting access points to use in each antenna beam that multibeam antenna system provided, to carry out radio communication by this access point.
CN2010102510053A 2009-08-07 2010-08-09 Systems and methods for mitigating interference between access points Pending CN101998424A (en)

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